Liquid pump



May 30, 1933. c. s. HAZARD 1,911,503

LIQUID PUMP Filed July 22, 1932 J resented in t Patented May 30, 1933 A UNITED STATES PATENT OFFICE CHARLES S. -HAZARD, 0]?4 FLUSHING, NEW YORK, ASSIGNOR T0 NEPTUNE METER f COMPANY, 0F NEW YORK, N. Y., A CORPORATION OF NEW JERSEY LIQUID P'UMIP Application led July 22, 1932. .Serial No. 624,003.

This invention relates to the construction of pumps adapted for the delivery under pressure of relatively heavy grease such as that used for the transmissions and dii'erentials of automobiles and it has for itsparticular purpose to provide a pump which will become inoperative when air is present in the liquid being measured. In this connection the present invention is applicable to pumps for use with any liquid regardless of its viscosity.

The invention will be more fully explained hereinafter with reference to the accompanying drawing, the single figure of which is a View in vertical sectional elevation of a pump which is constructed in accordance with the invention.

The construction illustrated in the drawing comprises a pump head a which may be formed with aivange, as at a1, by which the pump may be secured upon the top of the grease container from which the supply is to be drawn. It may also beA provided with an outlet a2 and with a bearing a8 for a crank shaft b -equipped with an operating handle b1, the crank being connected by apitman c with the pump plunger or piston rod d. The

cylinder ve, secured in any convenient manner to the pump head a is extended into the.

grease container 4(not shown) tothe desired depth and is provided at its lower end with an intake valve f. Secured to the plunger or piston rod d, near its upper end, is a piston g provided with apertures g1 and a springpressed lift valve g2. For a reason to be explained the piston gis formed with an extended `skirt g3 which has, just below the piston head, one or more ports g4, one of which,

in the lowest 1position of the piston, as repe drawing, registers with a port e1 in the wall of the cylinder@ the port e1 being closed by the skirt g3 of the' piston immediately after the upward movement of the piston begins. The plunger or piston rod d may also have at its lower end a piston k provided with apertures h1 and a lift valve la. Y

The u Ward motion of' the piston g draws in liquid) or air .or vboth through the ports f. On the downward stroke of the piston g .the liquid or the air or the mixture is put under compression by the spring loaded valve g2. the valve g2 the cylinder e, beneath the piston g, is completely full ofliquid. If, however, the cylinder e is full of air below the piston f or if there is a mixture .of air and liquid, the air c ontent will be compressed and the valve g2 will not open. At the bottom of the stroke, the port e1 will be opened. If the cylinder e is full of. air or if there is any air mixed with the liquid, this air, which has been compressed by the downward motion of the piston, will expand, blowing air and liquid out of the port e1. Thus, only liquid will iow through the valve g2 and the presence of a small quantity of air under the piston will render the pump inoperative. This action will take place even though the liquid is viscous and the air so intimately mixed therewith that 1t will not risel in thecylinder to `the underside of the piston g.

Since liquids are incompressible,' will be forced open provided that insures correct measurement of the delivered liquid. The meter is not an essential part of the device, however, as this pump may also be used-where it is desired to deliver an air-free-stream of liquid. n

In view of the fact that air cannot be separated from viscous or semiviscous liquid by settling out but rather remains therein'almost indefinitely, it will be seenthat theV foregoing mechanism is particularly well suited for use in connection with the pumping and metering of viscous and semiviscous liquids.

It will be understoodthat various changes inl details of construction and arrangement may be made to suitA different conditions of use or the convenience of the manufacturer and, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction shown and described herein.

I claim as my invention:

1. In a liquid pump, a cylinder provided with a port in its wall, an intake valve, a

piston provided with an aperture and a lift valve and having an extended skirt with a port for registration with the port of the cylinder wall, and means to reciprocate the piston.

2. In a liquid pump, a pump head, a cylinder secured to the pump head and provided with a port in its wall, an intake valve, a piston valve provided with an aperture and a lift valve and'having an extended skirt with a port for registration with the port of the cylinder Wall, a piston rod to which the piston is connected, a crank shaft mounted on the pump head, and a pitman connecting the crank and the piston rod.

3. In a liquid pump, a cylinder provided with a port in its Wall, an intake valve, a piston rod, a piston at the lower end of the piston rod and provided with an aperture and a lift valve, a second piston secured to the piston rod near its upper end and provided with an aperture and a lift valve and having an extended skirt with a port for registration with the port of the cylinder Wall, and means to reciprocate the piston ro This specification signed this '20 day of July, A. D. 1932. f

CHARLES S. HAZARD. 

